Fans of kids' literature and the book "If You Give a Mouse a Cookie," know how the story goes: If you give an app permission to leave a cookie, it will want to track your Amazon purchases. Then it will suggest that others who bought "Harry Potter" books bought these items as well. And would you mind terribly if it used a photo you took to sell something to a friend? And if it sells something to a friend, it will want to leave a cookie with your friend.

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